alexander



(No Model.) 2 sheets-sheet 1. U. D. ALEXANDER. SHEET METAL WORKING MACHINE. No. 541,800. Patented June 25, 1895.

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FIG. 3.

unALxANDERQ SHEET METAL WORKING MACHINE.

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WITNESSES:

M 5% @7E/aww NITED STATES PATENT OFFICE.

' RBANA D. ALEXANDER, OF CANNONSBURG, PENNSYLVANIA, ASSIGNOR OF ONE-HALF TO THE OANONSBURG IRON AND STEEL COMPANY, OF SAME PLACE.

SH EET-METAL-WORKI No MACH I N E.

SPECIFICATION forming lpart of Letters Patent No. 541,800, dated June 25, 1895.

Application led September 17, 1894. Serial No. 523,237- (No model.) i

b @ZZ whom it may concern:

Be it known that I, URBANA D. ALEXANDER, a citizen of the United States, residing at Can.- nonsburg, in the county of Vashington and State of Pennsylvania, have invented or dis* covered certain new and useful Improvements in Sheet-Met-al-Working Machines, of which improvements the following is a specilication.

The invention described herein relates to ro certain improvementsin machines for the formation of hooks on opposite edges of a metal sheet, said hooks being adapted to engage one another when the sheet is bent into tubular form.

I5 In general terms, the invention consists in the construction and combination substantially as hereinafter more fully described and particularly claimed.

In the accompanying drawings forming a 2o part of this specification, Figure l is a sectional elevation of my improved machine, the plane of section being indicated by the line Fig. 2. Fig. 2V is a transverse section, the plane of section being indicated by the line z5 y y, Fig. l. Fig. 3 is a side elevation of onehalf of the machine. Fig. 4 is atop plan view of the same; and Fig. 5 is an edge view of a sheet with hooks formed thereon.

The shoulder just back. of the hook along 3o one edge is formed in the sheet cutting machine.

In the practice Vof my invention, the bed plates 1, which are supported at the desired height invany suitable manner, are connected by side bars 2. The power shaft 3 is mounted in suitable bearings et on the side bars 2, and is provided at its ends with crank arms 5, which are connected by rods 6 to the slides 7. These slides are supported by shoulders 8 on 4o the sides ofthe. bed plates I, as shown in Fig. 2. Cross-bars 9 are bolted on the upper edges of the slides 7 near their ends, said bars extending across the bed plates, as shown in Figs. 2 and 4, and being provided along their inner edges with ribs or fins lO. On the bed plates are bolted the plates l1, which are provided on the edges adjacent to the cross bars 9 with grooves l2 of a width greater than the thickness of the ribs or fins by an amount at l5o least equal to twice the thickness of the sheets operated on.

In operating my improved machine, one edge of metal sheet is placed on the gage bar 13, which is adjustably supported by screws 14, passing vthrough the bed plates. As the cross-bar is shifted toward the .plates 11, the fins 10 force the sheets into the grooves 12,

` thereby causing the metal to be bent around the tins forming the hooks shown in Fig. 5. The sheet is then turned and its opposite 6o edge placed on the gage bar, so that a hook will be Vformed projecting on the opposite side of the sheet as shown in Fig. 5.

In. order to release the sheet from the grooves l2, pins l5 are passed through the 65 plates Il in line with the grooves, and shoulders 16 are so formed on the slides 7 as to come into contact with the pins as the crossbars are moved away from the plates 11. The movement imparted to the pins by the slides 7o forces the hooked portion of the metal sheets out of the grooves I2. The pins are moved in the opposite direction by the metal sheets as they are forced into the grooves, as described.

It will be observed that the two portions of the machine voperate alternately, so that two hooks are formed at each revolution of the power shaft and at the expense of only a lit-4 tle more power than would be required to op` 8o erate one half of the machine.

I claim herein as my invention-- 1. In a sheet metalworking machine, the combination of a stationary plate provided with a groove, a reciprocating cross-bar provided with a rib or iin, the walls of the groove being constructed to shift the portions of the sheet on opposite sides of the tin into parallelism, or approximate parallelism, with each other, and an adjustable gage plate for regu 9o lating the depth of the hook to be formed, substantially as set forth.

2. In a sheet metal working machine, the combination of a stationary plate provided with a groove, a reciprocating cross-bar provided with a rib or tin, and pins passing through the plate in line with the groove and movable with the cross-bar, substantially as set forth.

In testimony whereof I have hereunto set roo my hand.

URBANA D. ALEXANDER.

Witnesses:

DARWIN S. WoLco'rr, F. E. GAITHER. 

